I have posted previously and had some great advice from Bertsmobile1 and Rivets. The mower was sluggish, so decided to drain and replace the oil to see if that would help. On replacement I had advice on how to purge the system and after a while I managed to get forward and reverse motion from the elevated wheels. I had an issue on how to check and top up the oil. So decided to cut a disc with a hole cutter next to the seat and forward of the fuel tank, This allowed a much easier view of the port for checking the oil level and with a tube located in the hole and up through the hole I cut next to the seat, made it really easy to top up. I then dropped the mower and tried it for drive. It moves forward and back and will also cut the grass, but I am not convinced it is has the same pulling power as it should. I tried to navigate up a 30 deg slope and it would complete. When I took my foot off the forward drive the mower rolled back but very slowly, so not sure if this is helpful to determine the state of the Tuff Torg K51. If The feeling is I need to try and service the unit, has anybody an idea of were best to buy a K51 repair/service kit, as looking on line some of the prices are too expensive to warrant servicing the unit. Any help would be really appreciated. Terry